Motor-starting rheostat.



. f PATENTED AUG-.121, 1906 1). 0. JACKSON. MOTORHSTARTING RHEOSTAT.

APPIsIGA-TIOH FILED M$Y 21 l906.

2 SHEETS-SHEET 1.

D. O. JACKSON- MOTOR STARTING RHBOSTAT APPLICATION FILED MAYZI. 1906.

- 'PATENTED AUG. 21, 1906;

UNITED PATENT ()FFIGE.

.lfiG-ALD (l. JACKSON, OF MADlSOlNZ ll lSUONSlN n ense v {Specification of Letters Patent.

Patented Aug, 21, 1906.

Auplination filctl 21.1906. erial NO- 313,017.

class "of rh'eostets provided with switch-levers oda-pt'ed toclose separately and independently,'oire ot wluph forms the stortmg-lever mid 'is 1'etei.1ied in the on or running position by an electromagnet responding to no vol- *1 tinge thefailure or abnormal decrease of to relea se said lever and the other "responsive cleviceadepted to releasethe saline to effect the circuit upon the occurrence fun overload or ahnorinzilincrease of curren The inninohjcct of my invention is to provide in connection with these two lovers :i

look to prevent the sta-i'tin'glever-from living closeduntil the overload-lever is closed.

Fig ure' 1 is three View of a starting-rheostnt omhodyin my invention soul in which the two l everszirc shown in tlieii' (lewd positions," the"electrical connections oi the varii ous elements of the rheostnt and the rheostztt itself, with shun t'motor, being als (l ingrainliralticzrllv snr'iwniin this figure. liig. 2 is a fece view in w hich the two'levers are shown in open position. Fig. I? is a detail secti on'al iew:tekeuon the dotted line 3 3 of M 532, but showing the lower PELLL- of the pivotqposifi-in i"'el'ev-:ition.\ V Fig.- 4 is a detail viewolthe='-lever -pivotal mounting. F' 5' 7, 4 is esectiona-l view taken ontho (lotterlnice i 5 Of lirg. Sis no siniihn' view, but

the-overload-lover in the closed poand Fig-. 7 is tt detail view oi the stop Referring to'the drawings, the reference nu rnertl (leer connectmlin the usual manner to the conflict-buttons- 7 on the insulating, top or lace plate 1 of the st:i-rting-rheOstat. Switchievers 1'0" midi] l hnving operziti 11g knobs or handles; '12end 13,"?tre J'HOL'lHtMl uil a, pivot post 14, which is secured to the plate 1 of the 55 rheostat. 7' These low-rs nrc-i-ielrl normally in the open position by the springs 1 5a 11(l 16,

of wlnchlcversis associated with an electro gnzites resisl.%ince-coils or the the spring 1.6 being secured to the pivot-post lei and pressing against a, pin 17 on the lever 11, while the spring is secured to a boss on the lever 11 and. presses against a pin .18 on the lever 10. The pin 18 carries it resilient butler 19, which strikes against the lever 10 when both levers are thrown to the open po sition. i

The arrangement of the circuits (shown (li agranunaticellyin F ig. l) and the connections thereto ere asfollows: The oppbsite sides of the circuit to the motor are carried from the supply-mains through a double-pole hzi-url- I switch 2, one side branching and lending to the field-winding 3 of the motor, while the other branch 20 leads to the armature 4. The other side 21 passes to the tGl'lUllltl post 5 of the starting-box, thence through the overload release-rmignet 22 to the contactbutton 23, and when the lever 10 is over contact-button 23 and the lever 11 is over one of the live contact-buttons 7 the circuit is completed through the lovers 10 and: 1]. and cur rent may pass from the side 2] through. the

v armature 4; of the motor, since the liLSt contact-button on the top of the rheost trically connected to the terminal 1 selecthe rheostztt and in turn is connected by the conductor with the armature 4 Ofitliornb? torj The iielr'l-oircui't inny be traicedf'f 0111 any one of the content-buttons? upo'i 'iiiliilch' lever 11 may be resting through? novoltzigc release magnet 24 to'the tei ininil post 8 and thencethrough the motor lllfl, winding 3 to the junctionwith the arnitturc branch 20. I

' The switch-lever ll 0 is provided with a pin 26, which when the lever is inoverl into contact with the contact-l)Litton 23 is ongaigerl by the hook on one o-lthc arms of the (log 2'5, pivotally mourned) at 28 on thotop 'ot'the i'iieostat and preferably provider] with n? coi lspring ahoutits pivot to tend to hold the (log in thoposition shown in l i'g l." The oiliorj arm oi the (log rests nori :tllv against the" henilf 27' ol' the plun 'er fi, win-ii"mm through :i sleevei ll, pO'3',1 l; 'UllG(l. to ext curl wit li- 1n the solenoirlj 39- oil the overlozirl role-rise- Qningnct ".lihocore of the overlomlmagnet rest-s normally upon the upper (llll ol the screw -31, which. works through the l oltom of the hrnckr'ft-irzime 32-, whfich is sci curerl to the"overlonrl-magnet shell. The head on the core 30 may he utilized-as pointer oriurlex anil llu l'mmo'ill is provided witl'i grziiliizi iims; as shi wn, io indicate the strength of current which is to actuate plate of the rheostat 1.

the magnet. When the core is adjusted by the screw 31, the latter may be locked in positionby-the lock-nut 33. The lever 11 when in the'open position has the lower portion of the pin 17 abutting against the stop on the stop lever or catch 34, which lever or catch is pivotally mounted at 40 to move vertically in a recessed portion. 41in the top The lever is supported near its outer end by the spring 36, which is secured by a screw 37. The stop 35 prevents the closing movement of the lever 11 toward the right until the lever 10 is closedthat is, moved into contact with button 23thereloyv rubbing over the 11pwardly-canted end of the lever 34: to depress said stop 35-. As beforennentioned, when the-overload switch-lever 10 is moved over the contact-button 23-that isis closedit is caught in position by the hook 25. The underload switch-lever 1 1 can then be moved to the right or closed to gradually cutout re sistance in the motor-circuit. When the lever 11 has been moved to the right to a position over the last contact-button 7, should the voltage not be below a predetermined limit the armature 42', carried by the lever 11, will be attracted by the no-voltage magnet 24 and said lever be thereby held in that position.

It will be understood that in the above arrangement of the devices and circuits connectfil thereto should the lever 10 be released by the overload-magnet 22 acting on the hook-lever 25 the spring 15'will throw it into the open position, thereby breaking the circuit, and that in case of failure of current upon the line from any cause or an abnormal decrease of current in or the opening of the held-circuit the novoltage'magnet 24 is caused to release the lever 11, which is returned by its spring to the initial position. It will also be understood that should an overload occur while moving the startinglever 11 to the right the lever 10 will be thrown to the-open position andthe no-,

voltage ma net 24 will be deenergized and will not 110 d the lever 11 in the on position. When the starting-lever 11 is re-, leased by the no-voltage magnet and is thrown to the oncn position by the spring 16, the lower end of the pin 17 travels over the inolined stop 35, which readily depresses and again resumes the normal position'when the pin 17 has passed completely over it. This interposes said Stop in the path to the right of said pin, whereby the lever 11 is looked in open position until the lever 10 is moved into position over the contact-button 23, as herembefore mentioned.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent,'is v 1. In a motor-starting rheostat, the combination with a starting-lever and an over load-lever, an electromagnet to retain the starting-lever in the final or on position, said magnet. being responsive to the failure or abnormal decrease of current in the circuit to release said lever, an electromagnetic device responsive to an overload or abnormal increase of current to release said overloadlever, and a locln ng device topreventclosing the starting-lever until the overload-lever is closed. i

2. In a motor-starting rheostat, the combination with a startinglever and an overload-lever mounted upon the same pivot, a magnet to restrain the starting-lever in the final or on position and responding to failure or abnormal decrease of current to release said lever, an electromagnetic device associated with the overload-lever responsive to overload or abnormal increase of current to release said overload-lever, and a lock to prevent closing the said starting-lever until the said overload-lever is closed, substantially as described.

3. In a motor-starting rheostat, the combination with two spring-actuated levers mounted upon the same pivot, one of said levers being the startingdevei of the rheostat and the other the overload-lever, an. electromagnet associated withsaid starting-lever to retain the same in the final or on position to the lever and responsive to the failure or abnormal decrease of current in the circuit to release said starting-lever, means to restrain said overload-lever in its closed position, an 100 electroresponsive device in the circuit to release said means upon the occurrence of an overload or abnormal increase of current in the circuit, and a lock between said levers to prevent the closing of the starting-lever 1o 5 when the overload-lever is open, said lock being prevented from acting when the over load-lever is in its closed position, substantially as described.

4. In a switching device, the combination no of two switch-levers mounted on the same pivot, two electromagnets respectively ad apted to act each upon one lever, one electromagnet being associated with its lever to re lease it upon the failure of current or abnor- I15 mal decrease of voltage and the other electro- .magnet associated with its lever to release it upon an excessive flow of current, means for opening each switch upon releasing its lever, a handle on each lever affording opportunity I 20 for 'the individual movement thereof, and means to prevent closing the underlo ad-lever unless the overload-lever is closed.

In witness whereof I have hereunto subscribed my name in the presence of two wit- :2 5

nesses.

DUGALD O. JACKSON.

Witnesses:

E. G. lIOEFER,

Dom E. CASEY. 

